Sleep walking disorder, also known as sleepwalking disorder, is a condition in which a person suddenly rises from sleep to perform activities and then falls back to sleep, waking up with no knowledge of the activities during sleep. Nocturnal sleepwalking does not occur in dreams, but in the deep sleep stage 3-4 of sleep, which is concentrated in the first half of the night. The causes of sleepwalking disorder are: 1. Psychosocial factors Some children develop sleepwalking disorder related to psychosocial factors. For example, disturbance of daily life, environmental stress, anxiety and fear; family relationship, poor parent-child relationship, study tension and poor examination results are related to the occurrence of sleepwalking disorder. 2, sleep too deep As sleepwalking often occurs in the first 1/3 of sleep deep sleep period, so a variety of factors that make sleep deepen, such as overwork during the day, stay up late for several days to cause sleep deprivation, sleeping pills before bed, etc., can trigger the occurrence of sleepwalking. 3, genetic factors family survey shows that the patients of sleepwalking have more positive family history, and the rate of monozygotic twins is 6 times higher than the rate of dizygotic twins, indicating that the disease has a certain relationship with genetic factors. 4, developmental factors Because the disease occurs mostly in childhood, and gradually stops with age, indicating that sleepwalking may be related to the delayed development of the cerebral cortex.